#include <stdio.h>
int main() {
int score;
char grade;
printf("请输入一个0-100之间的整数表示成绩：");
scanf("%d", &score);
if (score >= 90) {
grade = 'A';
} else if (score >= 80) {
grade = 'B';
} else if (score >= 70) {
grade = 'C';
} else if (score >= 60) {
grade = 'D';
} else {
grade = 'E';
}
printf("成绩等级为：%c\n", grade);
return 0;
}